(3,25 - 1,5) * (-2,125 + 0,25) = 1,75 * (-1,875) = 1 3/4 * (-1 7/8) =
= 7/4 * (-15/8) = -105/32 = -3 9/32
(2,25 - 3,5) : 2/3 + 1/8 = -1 1/4 * 3/2 + 1/8 =
= -5/4 * 3/2 + 1/8 = -15/8 + 1/8 = -14/8 = -7/4 = -1 3/4
:)
